Add CRM order queue: live sync, view modal, receipt tabs, delete

Wires the CRM (exoCRM GetOrders) into the dashboard as a locally
persisted order queue instead of the previous static mockup:

- CrmClient Protocol + ExoCrmClient/StubCrmClient for the CRM's
  signed JSON-RPC API
- Order model + migration, synced from CRM on each queue view;
  soft-deleted orders stay hidden across re-syncs
- GET/DELETE /api/v1/orders with "no receipt"/"receipt issued" tabs
  (the latter is empty until Checkbox fiscalization lands)
- Dashboard: real order list, item-detail modal, tab switcher,
  one-click delete

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/features/orders/OrderDetailModal.tsx

@@ -0,0 +1,98 @@
+import { Modal } from '@/components/Modal'
+import '@/features/orders/OrderDetailModal.css'
+import type { Order } from '@/features/orders/types'
+
+interface OrderDetailModalProps {
+  order: Order
+  onClose: () => void
+}
+
+export function OrderDetailModal({ order, onClose }: OrderDetailModalProps) {
+  return (
+    <Modal onClose={onClose}>
+      <div className="order-modal">
+        <div className="order-modal-header">
+          <h3>Просмотр заказа {order.id}</h3>
+          <button type="button" className="order-modal-close" onClick={onClose} aria-label="Закрыть">
+            ×
+          </button>
+        </div>
+
+        <div className="order-modal-meta">
+          <div>
+            <span className="order-modal-label">Дата</span>
+            <span>{order.create_date_time}</span>
+          </div>
+          <div>
+            <span className="order-modal-label">Номер ТТН</span>
+            <span>{order.waybill_number || '—'}</span>
+          </div>
+          <div>
+            <span className="order-modal-label">Клиент</span>
+            <span>{order.recipient_name || '—'}</span>
+          </div>
+          <div>
+            <span className="order-modal-label">Телефон</span>
+            <span>{order.recipient_phone || '—'}</span>
+          </div>
+          {order.recipient_email && (
+            <div>
+              <span className="order-modal-label">Email</span>
+              <span>{order.recipient_email}</span>
+            </div>
+          )}
+        </div>
+
+        {order.notes && (
+          <div className="order-modal-notes">
+            <span className="order-modal-label">Заметки</span>
+            <p>{order.notes}</p>
+          </div>
+        )}
+
+        <table className="order-modal-goods">
+          <thead>
+            <tr>
+              <th>Наименование</th>
+              <th>SKU</th>
+              <th>Цена</th>
+              <th>Кол-во</th>
+              <th>Скидка</th>
+              <th>Сумма</th>
+            </tr>
+          </thead>
+          <tbody>
+            {order.goods.map((good) => (
+              <tr key={good.id}>
+                <td>{good.name}</td>
+                <td>{good.sku}</td>
+                <td>{good.price}</td>
+                <td>{good.quantity}</td>
+                <td>{good.discount_amount && good.discount_amount !== '0.00' ? good.discount_amount : '—'}</td>
+                <td>{good.amount}</td>
+              </tr>
+            ))}
+            {order.goods.length === 0 && (
+              <tr>
+                <td colSpan={6} className="order-modal-goods-empty">
+                  Товары не указаны
+                </td>
+              </tr>
+            )}
+          </tbody>
+        </table>
+
+        <div className="order-modal-total">
+          <span>Итого</span>
+          <span>{order.total_amount} ₴</span>
+        </div>
+
+        <div className="order-modal-actions">
+          <button type="button" className="order-modal-close-btn" onClick={onClose}>
+            Закрыть
+          </button>
+        </div>
+      </div>
+    </Modal>
+  )
+}